Re: How to add more item on pokemon gold?

Indeed. There are a lot of Teru-Sama items, and we edit them to add new items. There is an item tutorial by Koolboyman which you can find easily with google which explains the process in depth. But that only goes for items, not Pokemon. But there has been discussion of that here as well.

Re: How to add more item on pokemon gold?

I just edited items that I wouldn't use, and hope the length is accurate or less then what was there lol. You also have the problem of the said item acting like the item you replaced it with. For example, my Helix Fossil can spray water lmao! ASM coding it would work, I think Mateo's item editor could do that..not sure. I don't trust the Teru-Samas because I don't know what many of them do.

Don't forget to replace the matching description of the item you replace.